A pun in the form of a dad joke. Used to define defacto brothers (step brothers).
Lincoln has 2 step brothers. "Lincoln they are your defactbros bruv"
by bigoilyman June 1, 2017
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Relationship between two guys who are dating sisters.
Mark is a douche nozzle, but he is my defactbro and may be family some day
by Jeans74 May 21, 2012
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